How to unlock: Talk to Neriahon the upper deck of the Prydwenship (M7,2).

Neriah can be found on the upper deck of the main ship Prydwen. She is conducting a research and she needs blood samples of various species. The only way of getting them is looting the bodies of all enemies you defeat. Whenever you find a sample, return to Neriah and give it to her for some bottlecaps.

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